Pencil.



J. A. WALLS.

PENCIL. APPLIOATION FILED MAR. 7, 1913.

1,O?5 88O, Patented Oct. 14, 1913.

INVff/TOR WITNESSES ATTORNEYS JOHN A. WALLS, OF MOUNT WASHINGTON,MARYLAND.

PENCIL.

ovasso.

Specification of Letters Patent.

Patented Get. ML, 1913.

Application filed March 7, 1913. Serial No. 752,621.

To all whom it may concern Be it known that I, JOHN A. \VALLs, a citizenof the United States, and a resident of Mount \Vashington, in the countyof Baltimore and State of Maryland, have invented a new and ImprovedPencil, of which the following is a full, clear, and exact description.

This invention has special reference to new and useful improvements inpencils, and more particularly to pencils for writing ornamental signsand the like.

The essential object of the invention resides in the provision of apencil core so formed that in writing a succession of signs aribbon-like appearance will be given, which will show a progressivedevelopment of striated form, whereby an erasure or 111- terpolation maybe readily detected.

With the above and other objects in view the invention resides in thecombination and arrangements of parts to be hereinafter more fullydescribed and claimed.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which like characters of reference indicatecorresponding parts in all the views, and in which- Figure 1 is aperspective view of a pencil constructed in accordance with theinvention; Fig. 2 is a plan view illustrating the use and application ofthe improved pencil; Fig. 3 is a cross sectional view of the pencil; andFig. 4 is a plan view of a fragmentary portion of a pencil with amodified core.

In illustrating the preferred embodiment of the invention, my improvedpencil is indicated by the numeral 10 and is shown as being preferablyformed of two sections 11 secured together, whereby the cross section ofthe pencil is substantially oval, as shown in Fig. 3 of the drawings. Iwish to have it understood, however, that the cross section of thepencil may vary as shall be found desirable. The co-engaged faces of thesections 11 are provided with registering recesses 12 receiving theimproved core 13. This core is of flattened cross section andsufiiciently heterogeneous or non-homogeneous in any cross section asregards its marking properties, so as to produce a mark which, .uponclose examination, shall appear as a wide streak or ribbon of graduallychanging or developing complex striated or banded appearance. Thisapplication of the improved pencil is indicated in Fig. 2 of thedrawings, wherein a writing sheet 14 is illustrated as marked thereby.The core is shown as embodying a plurality of granules 14: or striac 15which may be of various colors, as shown. The core may be composed ofthe same substance in grauules or striae of different marking properties, or of different substances in granules or striac of differentmarking properties, or with mixed abrasive granules incorporated, or ofcombinations of the above; and by difference of marking properties isincluded differences in stain, smudge, perinanency, abrasion of surfacemarked, or reactance of chemicals, as indicated by the sev eral granulesor strive composing the core. It will thus appear that the pencil coreformed as above described will readily serve to distinguish or identifya mark by its striae, and any erasure or interpolation may be detectedby observing the abrupt change in the progressive development of theribbon st-riw.

Having thus described my invention,

'what I claim is 1. A pencil having a core which is nonhomogeneous incross section taken at different points.

2. A pencil core of flattened cross section and heterogeneous as regardsits marking properties at difierent cross sectional points.

3. A pencil having a core which is nonhomogeneou in any cross section,said core being composed of striac of different marking properties,whereby any erasure may be detected from the abrupt change in theprogressive development of the. mark produced thereby.

In testimony whereof .l have signed my name to this specification in thepresence of two subscribing witnesses.

JOHI\- A. WALLS.

Witnesses:

M. E. REILLY, J. '1. BROWN.

